System of electrical distribution.



B. R. SHOVER.

SYSTEM 0E ELECTRICAL DISTRIBUTION. APPYLIUATION FILED 11110.24, 1 906.

Patented May l1, 1909.

YIo

v 'two field rheostats R field, are 'connected into the circuit inthe BARTON R. SHOVER, OI"4 CHICAGO,

ILLINOIS,

ASSIGNOR TO ELECTRIC STORAGE BATTERY COMPANY, OF PHILADELPHIA, PENNSYLVANIA, A CORPORATION OF NEW JERSEY.

SYSTEM OF ELECTRICAL DISTRIBUTION.

Specification of Letters Patent.

Patented May I1, 1909.

- Application filed December 24, 1906. Serial No. 349,2802.

To allwhom it may cof/wem:

Be it known that I, BARTON R. Snovna, a citizen of the United States, and a resident of Chicago, in the county of Cook and State of Illinois, have invented certain new and 'useful System of Electrical Distribution, of

which the following is a specification.

One object of the present'invention is to provide quick acting nieans for controlling the operation of electro-dynamic transforming apparatus, .and another object of the inl vention is to provide for'properly controlling the transfer of energy between direct current and alternating current circuits in response to changes of electrical condition. l

In the drawings is illustrated diagraminatically a system of distribution embodying features of the invention. A, is athreephase alternating current generator furnish- Ing. current to the consumption circuit I, 2, 3. Connected to the same circuit, in parallel with the generator A, by the conductors 6,

7, and 8,-is an, alternating current dynamo machine C, to which is mechanically cony nected, as'by the shaft II, a direct current dynamo machine D. rihe latter is electricallyconnected to the -direct current. circuit.

4 5, and operates in parallel with a source of direct current B.

F, is the eld Winding of the machine 0 and F2, is the field winding of field windings are connected each other across the circuit and It?, one for each D. These two Inv series with usual Ina-nner. Across the saine circuit 4 5, are connected in series with each other the armatures of the eXciters E and G, which are also mechanically connected as by the shaft K. The conductor 9, which joins the two exciter armatures is connected by means of the conductor 11, to the conductor IO, which joins the field windings F, and F2. The voltage impressed upcn the field windings F, and F2, will vary with tlie voltage developed in the armatures E, and G, and

since these two armatures are connected in series across the circuit #5 the sum of these latter voltages is constant and equal to the voltage of the circuit L -5, and if one4 increases, the other will decrease by the saire amount. The armatures E, and G, being mounted on the' same shaft must revolve at the saine speed, and the division of voltage between them will be determined by the i relative amounts of currents flowing in their A respective field windings F3 and Ft. rIhese two field windings are also connected in series with each other across the circuit 4-5, and the conductor joining them is connected at the point L, by means of the conductor I2, to the junction point between the armatures E and G. The current in thefleld windings F3, and F, will therefore be determined by the voltage of the machines E, and G, modified however, by the rheostats It3 and l R4, which are connected respectively between the fields F3 and F4, and the junction point L.

For the purpose of co in the field windings F3, ing apparatus shown at M, and S, is introduced. .A conducting lever N, .is pivoted at one end and vibrates between the contacts 13, and 14, at the other end.- This lever is electrically connected to the junction point L, by means of the lconductor` 15. Contact points 13, and 14, are connected 4by conductors 16, and I7, 4respectively to the terminals of the rheostats R3 and It* opposite to the terminals thereof which are connected to L. When the lever N, makes contact with I4, it short-circuits the rheostat Rt, operation of rheostat R3, is not affected. On the other hand, when lever N, makes contact with 18, the rheostat R3, is shcrt-circuited trolling the current and the operation of rheostat R4, is nota'ected. Condensers4 Q1 and Q1, are connected across the rheostats R3, and R4, respectively, to suppress the spark whenthe short-circuits above mentioned are opened by the movement of' the lever N The posil `tion of the lever N, is determined by the action of the electro-magnet O, opposed by the spring P. 'hen O, is energized, it pulls the lever N, into contact wit-h 13. Then the circuit which energizes the magnet O, is opened, the spring P, pulls N, into contact with I4. The coil which energizes` the magnet O, is connected across the circuit 4-5, by the conductor IS-ltrf In this conductor i as shown in the part la thereof, is interposed a mahe-and-breah device shown at S. This device comprises two levers T, and U, each pivoted near its middle point, and making contact with each other at one end by means of the contacts shown at V. Conductor 19, l is connected to lever U and lever T, is connected to conductor 4, so that when the contact at V, is closed,the electro-magnet O, is

and F4, theiregulatand the Ico ' 20, whose Thi suspended, the core iiiie should .then as follows: W

- drawn into contact with 13, 'by the electroenergized. From the opposite end of lever is suspended the core of a solenoid W, 5 w "ch A l nating current line. As shown, the current is derived by means of conductors 21 and 22, z

secondary of the series transformer ,l primary is connected into one l phase 3, of the alternating current circuit, bel tween the terminal of the generator A, and the junction point of conductor 8, leading to l the alternating current machine C. The curl rent in solenoid W, Willtherefore vary with l the load on the generator A. From the other 1 end of lever U, is suspended a weight X. 's weight may be adjusted to balance the i pull of the solenoid with any desired load on l the generator A,` or the pull of the solenoid may be adjusted for any desired load by cutting coils in and out as by the switch Y. Il From the end of lever T, opposite to V, is also j of a solenoid l/Vl, whose l'is opposed by an adjustable spring P1. l solenoid W1, is connected between conductors 4 and 15, and is subjected to the voltage at the terminals of the exciter arina- ,l ture E. The effect of W1, is therefore to vary l the osition of lever T, in response to changes voltage of exciter The operation of the apparatus shown is 1' vhen the load on the conl sumption circuit 1, 2, 3, is equal to that l which it is`desired that the generator A,

from the the motor generator #A -l l 1, 2, 3, and l he lever l the for as soon as it is current circuit 1*5. l vibrate continuously between contact points 13 and 14,

magnet O, the rhe'ostat R3, will be short-cireuited, producing an increase of current in the field l and therefore increasing the voltage ol' the exciter E, at the expense of that of G. The result of this will. be to increase the solenoid W1, thus brea ring the contact at V and interrupting the current in solenoid O, which will release l the lever N, permitting it to break contact With 13, and make Acontact with 14. The ret sult of this will be to open the short-circuit around rheostat R3 and close that around rheostat R4, and the potential of exciter E, l will fall while that of IG, will rise. The fall of l pptential of E will reduce the pull of solenoid 1, ermitting the lever T, to restore contact at T? the solenoid O will again be energized and the above described cycle will be reeated. Only a very minuteinotion of thc ever T will lbe required to produce the rel sults above described, and therefore very slight variation of the voltage of the exciter E will occur on either side of the mean value necessary to give the excitation of the ull exerted by the machines if) and l), required to'maintain the l l length of time to furnish, the adjustment is suoli that l only a,`

lf the ldad on the 3, should increase,

a small increase getting back to the generator A, will increase the pull of solenoid W, on lever U, closing the contact V, which will remain closed until the eect of the electromagnet O, on the arm N, shall have kept the l rlieostat R3, short-circuited for a suliicient produce the necessary in crease of voltage in exciter E, and decrease of voltage in exciter G, required to cause the motor generator set C-D, to tran'smitl. enough energy from the circuit 4-5, tothe circuit 1, 2, 3, to supply the increase ofload on the latter. This will establish a new position for the levers U and T, determined' by Athe voltage of'exciter'E, necessary 'to produce the desired results, and by the e'ect of this voltage on the solenoid WR Having established this new position the lever N, will continue to vibrate between the contacts 13 andV 14 in response to the making and breaking' of contact at V, with the slight changes of voll tage of exciter-E, produced by the vibration d the load on the con- 9'0 2, 3, decrease, effects the reverse of those just described will take place. A small decrease in load on the generator A producing a decrease in the pull of solenoid W, on the lever U, will open the contact at V, and thus interrupt the -current which energizes the magnet O. This will release the le ver N, allowing it to come in contact with 14, thus short-circuiting the rheostat R4. The result of this will be to increase the voltage of exciter G, and decrease the voltage of exciter E, thus causing the alternating current machine C, to receive current from the circuit 1, 2, 3, and the direct current machine D, to deliver current to they circuit 4-5.r The' decrease in the voltage of exciter E, by its efof lever N. Shoul sumption circuit 1,

-feet on the solenoid W1, will establish a new position for the lever T, corresponding to the voltage of exciter E, which is necessary to maintain the desired transfer of energy from the circuit 1, 2, 3, to the circuit 4 5. Having thus established this new position of the lever T, equilibrium will again be restored and the lever N, will continue to vibrate as above described. It will be seen that so long as the weight of X and the number of oils of W, included in the circuit remain the same, the 'load on generator A, will remain )ractically constant, since equilibrium of the lever U, can only be maintained for one pa ticular load on generator A, and any departure from this load will vcause the regulating apparatus to act in such manner on the metor generator set, C-D, as to'restore the equilibrium.

I claim:

1. In combination, an alternating current consumption circuit and its source a direct current circuit and its source transforming apparatus connected to both circuits. and

adapted to transfer energy from eitliercircuit to the other and provided with iieldwiiidings connected in series with each other and whereof one is adapted to control its alterry nating current electro-inotive-force, and the i other is adapted to control its direct current l tures of the exciter set.

'2. ln combination an alternating current consumption circuitand its source, a direct current circuit and its soul-ce; transforming apparatus connected to both circuits and adapted to transfer ener from either to the other, and provided wit two iieldwindings whereof one is adapted to control its alternating current electro-motive-force, and the other is adapted to control its direct current electro-moti'vje-force; means for connecting said field windings in series with each other across a source of exciting current, an exciter set including two 4armatures mechanical-ly connected and electrically connected in series with each other across the said source of e);- citing current; an electrical'connection from the circuit between the two armatures to the circuit between the two field windingsyand means responsive to changes ofloa'd on the alternating current circuit for varying the division of electro-motive-forcc between the two armatures.

l l l,

l l i l l l 3. In combination an`alte`lrnating current consumption circuit and its source, a direct current circuit and its source; transforming apparatus connectcd to. both circuits and adapted to transfer energy from either to the other and'provided with two field windings 45 whereof one is adapted to control its alternating current electro-motive-force and the other is adapted to controllits direct current electro-niotive-force; means for connecting said-field windings in series with each other across a source of exciting current, and means responsive to changes in the electrical condition of the alternating current circuit for varying the potential of the junction be- Y tween tlic two windings with respect to that of the terminal of the source of exciting current.

Means for controlling the operation of electro dynamic transforming apparatus which comprises a balancing set for controlling the respective fields of said apparatus and electro-magnetic means for controlling the fields of the balancing set, substantially as described. l

5. Meansfor controlling the operation of electro dynamic transforming apparatus in response to changes of electrical condition of a circuit, which comprise abalancingset for controlling the respective iields of said apparatus, and electro-ma netic vibrating -70 devices responsive' .to suc changes and adapted to control the fields ofthe balancing set, substantially as described. f

In testimony whereof I have hereunto signed my name. A A

- BARTON ii. SHOVER. c In the presence of- J. LESTER WOODBRIDGE, E. VAiLSI'rEBBiNs. 

